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- Dewey Decimal Classification (DDC) (27)
- 600 Technology (Applied sciences) (27)
- 621 Applied physics (27)
- 621.3 Electrical, magnetic, optical, communications, computer engineering; electronics, lighting (27)
- 621.31 Generations, modification, storage, transmission of electric power (27)
- 621.312 Generation, modification, storage (27)
- 621.312 1 Generation (27)
- 621.312 13 Specific kinds of mechanical generations (27)
- 621.312 1 Generation (27)
- 621.312 Generation, modification, storage (27)
- 621.31 Generations, modification, storage, transmission of electric power (27)
- 621.3 Electrical, magnetic, optical, communications, computer engineering; electronics, lighting (27)
- 621 Applied physics (27)
- 600 Technology (Applied sciences) (27)
Number of items at this level: 0.